Safety locking mechanism for a mechanical lifting jack

(19)

(11)

EP 0 950 633 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	14.11.2001 Bulletin 2001/46

(43)	Date of publication A2:
	20.10.1999 Bulletin 1999/42

(21)	Application number: 99302830.7

(22)	Date of filing: 13.04.1999

(51)	International Patent Classification (IPC)⁷: B66F 1/06

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

15.04.1998 CA 2234885

(71)	Applicant: Northman Holdings Inc.
	Kitchener, Ontario N2N 3H6 (CA)

(72)	Inventor:
	Boulanger, David M. Kitchener, Ontario N2N 3H6 (CA)

(74)	Representative: Hillier, Peter et al
	Edward Evans Barker Clifford's Inn Fetter Lane London EC4A 1BZ London EC4A 1BZ (GB)

(54)	Safety locking mechanism for a mechanical lifting jack

(57) A mechanical lifting jack (10) with a locking mechanism that arrests upward motion of the handle (22) if the handle (22) is suddenly released by the operator while raising or lowering a load. A latch (60) on the pivot attachment of the handle (22) to the lifting assembly is actuated by a lever (70) disposed at the distal end of the handle (22), and engages into a toothed safety link (42) when the lever (70) is released. In the event that the operator suddenly releases the handle (22) accidentally, the latch (60) engages the safety link (42) to arrest the upward motion of the handle (22). The invention can also be used to lock the handle (22) into an upright position alongside the vertical support (12) for compact storage.

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